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#include <stdio.h>
 
unsigned long long arr[100] = {0, 1, 1};
int n;
 
unsigned long long fibo(n) 
{
    for(int i = 3; i <= n; i++)
    {
        arr[i] = arr[i - 1] + arr[i - 2];
    }
        return arr[n]; //= fibo(n - 1) + fibo(n - 2);
}
 
int main(void) {
    scanf("%d", &n);
    printf("%lld", fibo(n));
}

prog.cpp:7:1: error: expected ‘,’ or ‘;’ before ‘{’ token
 {
 ^
prog.cpp: In function ‘int main()’:
prog.cpp:17:26: error: ‘fibo’ cannot be used as a function
     printf("%lld", fibo(n));
                          ^
prog.cpp:16:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~

Standard output is empty